I had treatment of tinnitus here, but this shop did custom-fit work, and they'd likely know much about custom plugs. This is the audiologist who actually prescribed listening to music heavily as part of a neuro-physiological prognosis. They're hip, and perhaps I recall some literature for such plugs in their office. They have three offices, and I went to Culver City. Call them (or anyone) up ahead of time to be sure. www.thehearingdoctor.com